Question

X+4y=8 2x-5y=29 Answer please

Answer 1

$\left \{ {{x+4y=8\ \ | multiply\ by\ -2} \atop {2x-5y=29\ \ \ \ \ \ \ \ \ \ \ \ \ \ }} \right. \\\\ \left \{ {{-2x-8y=-16} \atop {2x-5y=29}} \right. \\+-----\\ add\ both\ equations\\\\ -13y=13\ \ \ | divide\ by \ -13\\\\ y=-1\\\\ x=8-4y=8-4(-1)=8+4=12\\\\ x=12$